18943769955439 has 6 divisors (see below), whose sum is σ = 22036630356384. Its totient is φ = 16237517104620.

The previous prime is 18943769955437. The next prime is 18943769955479. The reversal of 18943769955439 is 93455996734981.

It is not a de Polignac number, because 18943769955439 - 2¹ = 18943769955437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943769955437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 193303775007 + ... + 193303775104.

It is an arithmetic number, because the mean of its divisors is an integer number (3672771726064).

Almost surely, 2^{18943769955439} is an apocalyptic number.

18943769955439 is a deficient number, since it is larger than the sum of its proper divisors (3092860400945).

18943769955439 is an equidigital number, since it uses as much as digits as its factorization.

18943769955439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386607550125 (or 386607550118 counting only the distinct ones).

The product of its digits is 7936185600, while the sum is 82.

The spelling of 18943769955439 in words is "eighteen trillion, nine hundred forty-three billion, seven hundred sixty-nine million, nine hundred fifty-five thousand, four hundred thirty-nine".